Greater safety, reliability highlighted in power supplies for medical products

Companies turning out power supplies for medical applications target more upgrades to IEC 60601-1 3.1 and DOE Level VI qualifications to boost competitiveness.

Improved product safety and reliability continue to drive the production of power supplies for the medical field in mainland China. This is to meet the stiffer requirements in this application as manufacturers capitalize on the growing market.

On their roadmap are switching power supplies for hospital equipment and AC/DC adapters for home-use devices, which are based on the higher IEC 60601-1 3.1 and DOE Level VI standards. Fuhua Electronic Co. Ltd offers 2xMOPP models with the latter efficiency rating and the CoC Version 5, Tier 2 counterpart.

The majority has products compliant with the immediately preceding criteria, in addition to Energy Star 6.0. All, however, follow the 2xMOPP safety requirement, which ensures backup protection in case the primary measure fails. Products conform to international standards such as CCC, CE, CQC, PSC, KC, TLC and UL as well.

At Power-Win Technology Corp., an interviewed manufacturer from Taiwan, the selection fulfills the 2xMOPP, IEC 60601-1 3.1 and DOE Level VI specifications. The power supplies also pass CB, CE, CSA, EU ErP Tier 2, EMC 60601-1-2 4th Edition, EN 55011 Class B, FCC Part 18 Class B, NEMKO, TÜV and UL.

As an assurance of enhanced reliability, Zhongshan Kingrong Electronics Co. Ltd presents a model that supports 100 percent full load in 40 C and a minimum of 4 hours. The unit with MTBF of up to MIL-HDBK-217F has full-load capacity at 25 C for more than 50,000 hours and withstands 3kV/min. It meets AS, CB, CE, CEC, Energy Star 5.0, ErP, EuP, MEPS and IEC/EN 60601.

Makers likewise pursue the development of high-power units for a wider range of power supply options. Fuhua will introduce 150 and 200W models.

In terms of applications, releases for hospital equipment account for a bigger share of shipments. More domestic companies, however, are expected to target home-use medical devices as global demand for such terminal products climbs.

Manufacturers' prospects for the line include the local market. The mainland medical equipment industry posted a CAGR of nearly 21 percent in the past several years, according to statistics from government agency CDA. It is projected to reach $92.3 billion in 2018 from $56.9 billion in 2016.

The corresponding power supply segment benefited with a 15 to 20 percent sales growth.Most makers forecast the rate of increase will stay above 10 percent in the next one or two years, and plan to raise production accordingly.

Fuhua has invested $33 million in a new factory, which will commence operations within the next one year. Taiwan company Power-Win will continue to bolster output by 5 to 10 percent.

More than 100 companies turn out power supplies for medical products in China, over half of which are local enterprises. The major makers include Mornsun, Fuhua, Shenzhen Moso and Hengfu, and the foreign ones Mean Well and XP Power.

All suppliers offer other types of power supplies. Units for the medical field account for 20 to 60 percent of their total shipments, with 30 to 80 percent sent overseas. The key destinations are Europe, North America and East Asia, while Russia, the Middle East and South America will continue to attract attention.

Entrants to the line are expected to set up their factories in the cities of Shenzhen, Dongguan and Zhongshan in Guangdong province, Hangzhou in Zhejiang, Suzhou in Jiangsu, and Shanghai.

Open-frame & AC/DC types

China's mainstream switching power supplies for medical products consist of open-frame units for hospital-use equipment and AC/DC adapters for home-use devices. These come in variants with 3.3 to 48V rated voltage and 5 to 600W rated power. The leakage current is 50µA.

Units provide 2xMOPP and comply with relevant standards such as CE, cUL, DOE Level V, IEC 60601-1 and UL.

The key components and materials used include ICs, transformers, thyristors, filters, PCBs, other passive components and cases. The first input is usually sourced from foreign suppliers such as TI, Fairchild and STMicroelectronics. Some makers also purchase passive components from TDK, Murata and Yageo.

After rising in the past year, the cost of manufacturing inputs and labor is anticipated to stabilize in the months ahead. The same trend is forecast for product prices.

The products in this gallery have been handpicked by our mainland China-based market analyst for representing current trends in power supplies for medical applications from mainland China and Taiwan makers.

5V, up to 1.2A power supply

Model FRM06-S05-UU power supply for home medical devices from FranMar International Inc. has 90 to 264VAC, 47 to 63Hz input, with maximum 0.3A at 100VAC full load, and 5V, up to 1.2A output. Its withstand voltage is 5,656VDC and maximum leakage current 0.1mA.

The 64.1x28.1x42mm product integrates overvoltage, -load and short-circuit protection, and meets CB, CE, EMC, EN 60601-1, IEC and UL standards.

The minimum order quantity for the 6W model is 500 units. Delivery takes 40 days.

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2xMOPP power supply

For type BF home medical devices, this power supply from Fuhua Electronic Co. Ltd, model UES200, comes with four AC inlets and provides 2xMOPP input to output isolation. It has 12 to 48V output voltage, 200W rated power and ≤100µA leakage current, and consumes ≤0.15W on standby. The operating altitude is up to 5,000m.

The product meets CoC Version 5 Tier 2, DOE Level VI and IEC 61000-4-5 requirements.

The minimum order is 200 units. Delivery is within 45 days.

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Power supply has 89% efficiency

Power-Win Technology Corp. offers model PW-250A-1YxxxP1Mz power supply with 90 to 264VAC, 47 to 63Hz input, and 2.5A maximum input current at 115VAC and 1.3A at 230VAC. Its average efficiency is 89 percent.

For home medical devices, the 200x90x45mm and 1.3kg MOPP unit boasts more than 0.95 power factor at 115VAC and exceeds 0.9 at 230VAC full load. It operates in -20 to 60 C. Standards met are CB, cUL, IEC 60601-1-2:2014, RoHS, TÜV and UL.

The order quantity is negotiable. Delivery lead time is 56days.

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Power supply with 0.2A maximum input current

From Starwell Technology Co. Ltd, the SW-01120150-S04US model is a power supply with an average failure rate of 50,000 hours. It has 100 to 240VAC, 50/60Hz, maximum 0.2A input, and 80mV ripple.

The 65.3x42.7x50mm unit has built-in overcurrent, -load, -voltage and short-circuit protection and operates in 0 to 40 C at 5 to 90 percent relative humidity. It complies with CE, CEC Level VI, C-Tick, Energy Star 6, EuP VI, FCC, GS, IEC 60601 and 60950, SAA, TÜV, and UL 60601 and 60950.

The maker requires a minimum order of 2,000 units for delivery within 18 days.

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Power supply boasts 5% output voltage precision

This power supply for home medical devices from Zhongshan Kingrong Electronics Co. Ltd, KRE006SPS-0600R50W model, has 100 to 240VAC, 50/60Hz, maximum 150mA input and
6VDC, 1,000mA output, with 5 percent output voltage precision. Its maximum leakage current is 0.25mA at 264VAC and withstand voltage is 3kV/min at up to 10mA. The no-load input power is 0.3W and efficiency 60 to 88 percent.

The unit with overvoltage, -current, short-circuit protection and thermal shutdown protection operates in 0 to 40 C. It meets AS, CB, CE, CEC, IEC/EN 6060, EN 55011, Energy Star 5.0, ErP/EuP and MEPS.

The 3,000-unit minimum order is for delivery within 30 days.

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